CS3524A
Voltage Mode
PWM Control Circuit with
200 mA Output Drivers
The CS3524A PWM control circuit retains the same versatile
architecture of the industry standard CS3524 (SG3524) while adding
substantial improvements.
http://onsemi.com
The CS3524 is pin–compatible with “non–A” versions, and in most
applications can be directly interchanged. The CS3524A, however,
eliminates many of the design restrictions which had previously
required additional external circuitry.
MARKING
DIAGRAMS
16
16
The CS3524A includes a precision 5.0 V reference trimmed to ±1%
accuracy (eliminating the need for potentiometer adjustments), an
error amplifier with an output voltage swing extending to 5.0 V, and a
current sense amplifier useful in either the ground or power supply
output lines. The uncommitted 60 V, 200 mA NPN output pair greatly
enhances the output drive capability.
CS3524A
AWLYYWW
1
DIP–16
N SUFFIX
CASE 648
1
16
The CS3524A features an undervoltage lockout circuit which
disables all internal circuitry (except the reference) until the input
voltage has risen to 8.0 V. This holds standby current low until
turn–on, and greatly simplifies the design of low power, off–line
supplies. The turn–on circuit has approximately 600 mV of hysteresis
for jitter free activation.
16
CS3524A
1
AWLYYWW
SO–16L
DW SUFFIX
CASE 751G
1
Other improvements include a PWM latch that insures freedom
from multiple pulsing within a period, even in noisy environments;
logic to eliminate double pulsing on a single output, a 200 ns external
shutdown capability, and automatic thermal protection from excessive
chip temperature. The oscillator circuit is usable to 500 kHz and is
easier to synchronize with an external clock pulse.
A
WL, L
YY, Y
= Assembly Location
= Wafer Lot
= Year
WW, W = Work Week
PIN CONNECTIONS
Features
• Precision Reference Internally Trimmed to ±1%
• Current Limit
• Undervoltage Lockout
• Start–Up Supply Current < 4.0 mA
• Output to 200 mA
• 60 V Output Capability
• Wide Common–Mode Input Range for Error and Current Limit
Amplifiers
1
EA–
EA+
V
REF
V
IN
SYNC
E
B
I
V
OUTB
SENSE+
I
V
OUTA
SENSE–
R
C
E
A
T
SHUTDOWN
COMP
T
GND
• PWM Latch Insures Single Pulse per Period
• Double Pulse Suppression
• 200 ns Shutdown
ORDERING INFORMATION
• Guaranteed Frequency
• Thermal Shutdown
Device
Package
Shipping
CS3524AGN16
25 Units/Rail
46 Units/Rail
DIP–16
SO–16L
SO–16L
CS3524AGDW16
CS3524AGDWR16
1000 Tape & Reel
Semiconductor Components Industries, LLC, 2001
1
Publication Order Number:
December, 2000 – Rev. 3
CS3524A/D